The people of Puerto Rico have been working — the people themselves — since the moment the hurricane passed to help clear neighborhoods and roads of debris, and doing the work necessary to rebuild. They’ve been sharing and pooling resources and helping each other. If you’re able to donate, consider the options below that fund efforts which directly support the people and the process of recovery.
With some EQ, dynamics, and imaging adjustments, mastering can fine-tune the blending of sounds within the entire song, but it won’t make any major volume level or sonic flavor adjustments to individual components. You don’t want to focus so much on trying to boost the overall song volume level when you are mixing as that is an aspect that would apply to the master output of the mix and, hence, should be left to the mastering engineer to handle for you. The only overall volume level issue you need to worry about during mixing is to make sure your levels are not clipping as it will cause digital distortion that cannot be repaired in mastering.